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Preparation method of magnesium alloy black arc discharge ceramic layer

A technology of arc discharge and magnesium alloy, which is applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of the combination of wear-resistant film and substrate, film forming speed, and corrosion resistance.

Pending Publication Date: 2021-12-03
东莞市恒核机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a magnesium alloy black arc discharge ceramic layer in order to overcome the deficiencies of the prior art, which solves the problems of wear resistance, bonding force between the film layer and the substrate, film forming speed, and corrosion resistance in the prior art. The problem that aspect can not take into account, content of the present invention is as follows:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, the magnesium alloy is immersed in the electrolyte solution for arc discharge treatment to obtain a magnesium alloy black arc discharge ceramic layer; wherein each 1L of the electrolyte solution includes 12g of silicate, 5g of aluminate, 15L of hydrogen oxide aqueous solution, 10g fluoride, 7g of sodium hydroxide, 12g of glycerin, 1g of disodium edetate.

[0024] Wherein, the pH value of the electrolyte solution is 12.

[0025] Among them, the silicate is sodium silicate.

[0026] Wherein, the aluminate is sodium aluminate.

[0027] Wherein, the arc discharge is a double pulse power supply, the current of the arc discharge is 0.4A, the frequency is 500Hz, the duty cycle is 20%, and the time is 5min.

[0028] Wherein, the concentration of hydrogen peroxide aqueous solution is 50wt.%.

[0029] Among them, the fluoride is hydrofluoric acid.

[0030] Among them, the purity of sodium hydroxide is 99.99%.

[0031] According to the above formula proces...

Embodiment 2

[0037] In this embodiment, the magnesium alloy is immersed in the electrolyte for arc discharge treatment to obtain a magnesium alloy black arc discharge ceramic layer; wherein each 1L of the electrolyte includes 10g of silicate, 4g of aluminate, 10L of hydrogen oxide aqueous solution, 8g fluoride, 6g of sodium hydroxide, 10g of glycerin, 0.5g of disodium edetate.

[0038] Wherein, the pH value of the electrolyte solution is 10.

[0039] Among them, the silicate is zinc silicate.

[0040] Among them, the aluminate is potassium aluminate.

[0041] Wherein, the arc discharge is a double-pulse power supply, the current of the arc discharge is 0.3A, the frequency is 400Hz, the duty cycle is 10%, and the time is 4min.

[0042] Wherein, the concentration of hydrogen peroxide aqueous solution is 40wt.%.

[0043] Among them, the fluoride is ammonium fluoride.

[0044] Among them, the purity of sodium hydroxide is 99.99%.

[0045] According to the above formula process, the prepar...

Embodiment 3

[0051] In this embodiment, the magnesium alloy is immersed in the electrolyte for arc discharge treatment to obtain a magnesium alloy black arc discharge ceramic layer; wherein each 1L of the electrolyte includes 14g of silicate, 6g of aluminate, 20L of hydrogen oxide aqueous solution, 12g fluoride, 8g of sodium hydroxide, 14g of glycerin, 2g of disodium edetate.

[0052] Wherein, the pH value of the electrolyte solution is 14.

[0053] Among them, the silicate is aluminum silicate.

[0054] Wherein, the aluminate is a mixture of sodium aluminate and potassium aluminate, wherein the mass ratio of sodium aluminate to potassium aluminate is 1:1.

[0055] Wherein, the arc discharge is a double pulse power supply, the current of the arc discharge is 0.5A, the frequency is 600Hz, the duty cycle is 30%, and the time is 6min.

[0056] Wherein, the concentration of hydrogen peroxide aqueous solution is 60wt.%.

[0057] Wherein, the fluoride is ammonium bifluoride.

[0058] Among the...

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Abstract

The invention belongs to the technical field of magnesium alloy surface treatment, and particularly relates to a preparation method of a magnesium alloy black arc discharge ceramic layer. The magnesium alloy black arc discharge ceramic layer is obtained by immersing a magnesium alloy in an electrolyte solution to be subjected to arc discharge treatment. The electrolyte solution comprises silicate, aluminate, hydrogen peroxide, potassium fluoride, sodium hydroxide, glycerol and disodium ethylene diamine tetraacetate, the electrolyte solution is prepared by taking a silicate and aluminate system as an electrolyte, the content of MgAl2O4 in the magnesium alloy black arc discharge ceramic layer is greatly increased, so that wear resistance of the magnesium alloy black arc discharge ceramic layer is greatly improved, wear resistance of a film layer prepared through the system is good, the binding force between the film layer and a matrix is good, and meanwhile good effects can be achieved in the aspects of the film forming speed and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and in particular relates to a preparation method of a magnesium alloy black arc discharge ceramic layer. Background technique [0002] Most magnesium alloys have low hardness, poor wear resistance and corrosion resistance, which greatly limit their application. Therefore, it is necessary to carry out corresponding surface modification treatment. Arc discharge treatment is an effective means to improve the hardness, corrosion resistance and wear resistance of magnesium alloys. The formation of the arc discharge film and the structure and performance of the film are affected by various factors such as electrical parameters, electrolyte composition and concentration, etc. The composition of the electrolyte largely determines the composition and performance of the oxide film. Electrolytes used in arc discharge treatment of magnesium alloys are roughly divided into two type...

Claims

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Application Information

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IPC IPC(8): C25D11/30
CPCC25D11/30C25D11/026
Inventor 叶友谦
Owner 东莞市恒核机电科技有限公司
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